While I realize this is a controversial topic, even among high-level experienced fighting exponents, I’m an advocate in training of learning not to divulge important information to your opponent on pain tolerance or threshold. Learning to control screaming/yelling, minimizing facial reactions, controlling body language under pressure, testing limits of tolerance (the maximum level of pain you can withstand, within reason or hitting a safe tolerable level) AND threshold (when you start to acknowledge pain), extending “time ’til tap” or eliminating “submission” training altogether (even the term infers of learning to submit to a superior opponent when things get tough, which can lead to bad neural conditioning), extending past your believed maximum limit in cardio, etc. Up to and including pain-conditioning itself. These elements build both critical areas of mindset and self-control/resilience mid-physical training. Stacking both simultaneously leads to faster and correct conditioning.